/Engine/Plugins/Animation/ControlRig/Source/ControlRigDeveloper/Public/ControlRigBlueprint.h
Remove a transient / temporary control used to interact with a bone
[FName](API\Runtime\Core\UObject\FName) AddTransientControl ( const [FRigElementKey](API\Plugins\ControlRig\Rigs\FRigElementKey) & InElement )